What is the circuit's name ?

[daisyinfall]

Which specification cant be meeted? Is the UGBW?
I have tried this OPamp for practise , and I find the UGBW is a problem....

Added after 3 minutes:

em.....And the slew rate is not easy to get 50v/uS...

 

[shaq]

Is this folded-cascode?

And, why does it use Rz and Cc ?

How to measure CMRR,DC gain,UGBW,SR,Phase margin,ICMR,Output swing and PSRR for this two-stage folded-cascode op amp?

 

[smaswi]

Yes, SR is related to GBW
In the above figure, the input slewrate SR_in=GWB*Vdsat(M1)


Btw,shaq, why you deleted the opamp design spec article?
I am interested in it.

Sorry, flushrat...

Because nobody replay that question for a long time, so I delete it.

Now I hear you're interesting in it, I'm so surprise!

Here is my spec.



inmy opinion ,your spec has some problems on the power comsumption and slew rate
for example:if the compensation capacitance is 2pf,we need a current of 20mA.
if the supply is 3.3v,then the power comsumption will be much more than your demand

Maybe we can discuss how to design this circuit!

 

[WILLIAM.YAO]

suria3 is realy good at transistor

 

[flushrat]

Hi smaswi
I have tried this circuit, 0.5pf is enough for compensation. I think there maybe some mistake in your calculation.
from SR=2I/(Cc+Cload)
I=0.5*50e6*(0.5e-12+2e-12)=62.5uA

 

[shaq]

Hi smaswi
I have tried this circuit, 0.5pf is enough for compensation. I think there maybe some mistake in your calculation.
from SR=2I/(Cc+Cload)
I=0.5*50e6*(0.5e-12+2e-12)=62.5uA

I think 2I that you mean should be the current of M0.

But, how about Sro?

I don't understand what it means.

What is different between Sr and Sro?